<template>
  <div>
    <el-upload
      action='http://chenyu-music.oss-cn-beijing.aliyuncs.com'
      :data='dataObj'
      list-type='picture'
      :multiple='false' :show-file-list='showFileList'
      :file-list='fileList'
      :before-upload='beforeUpload'
      :on-remove='handleRemove'
      :on-success='handleUploadSuccess'
      :on-preview='handlePreview'>
      <el-button size='small' type='primary'>点击上传</el-button>
      <div slot='tip' class='el-upload__tip'>只能上传jpg/png文件，且不超过10MB</div>
    </el-upload>
    <el-dialog :visible.sync='dialogVisible'>
      <img width='100%' :src='fileList[0].url' alt=''>
    </el-dialog>
  </div>
</template>
<script>
import {getOssPolicy} from './policy'
import {getUUID} from '@/utils'
export default {
  name: 'singlePicUpload',
  props: {
    value: String
  },
  computed: {
    imageUrl () {
      return this.value
    },
    imageName () {
      if (this.value != null && this.value !== '') {
        return this.value.substr(this.value.lastIndexOf('/') + 1)
      } else {
        return null
      }
    },
    fileList () {
      return [{
        name: this.imageName,
        url: this.imageUrl
      }]
    },
    showFileList: {
      get: function () {
        return this.value !== null && this.value !== '' && this.value !== undefined
      },
      set: function (newValue) {
      }
    }
  },
  data () {
    return {
      dataObj: {
        policy: '',
        signature: '',
        key: '',
        ossAccessKeyId: '',
        dir: '',
        host: ''
        // callback:'',
      },
      dialogVisible: false
    }
  },
  methods: {
    emitInput (val) {
      this.$emit('input', val)
    },
    handleRemove (file, fileList) {
      this.emitInput('')
    },
    handlePreview (file) {
      this.dialogVisible = true
    },
    beforeUpload (file) {
      let _self = this
      return new Promise((resolve, reject) => {
        getOssPolicy().then(response => {
          console.log('response', response)
          console.log('file', file.name)
          _self.dataObj.policy = response.data.policy
          _self.dataObj.signature = response.data.signature
          _self.dataObj.ossAccessKeyId = response.data.accessid
          _self.dataObj.key = response.data.dir + '/' + getUUID() + '_' + file.name
          _self.dataObj.dir = response.data.dir
          _self.dataObj.host = response.data.host
          resolve(true)
        }).catch(err => {
          console.log(err)
          // reject('出错了')
        })
      })
    },
    handleUploadSuccess (res, file) {
      console.log('上传成功...1', res)
      console.log('上传成功...2', file)
      this.showFileList = true
      this.fileList.pop()
      this.fileList.push({
        name: file.name,
        url: this.dataObj.host + '/' + this.dataObj.key
      })
      console.log('url', this.dataObj.host + '/' + this.dataObj.key)
      this.emitInput(this.fileList[0].url)
    }
  }
}
</script>
<style>

</style>
